Spray gun



Sept. 22, 1931. c. A. NORGREN S PRAY GUN Filed April 16, 1928 INVENTOR.

Patented Sept. 22, 1931 cARnA. NOBGREN, or nnnvrua, COLORADO:

I V SPRAY Gun Application filed n rnrle,

This invention relates to lubricating guns of the type in which a lubricant contained in a siphon cup, is discharged through a noz-i 1 zle in the form of a spray, through the rnedi '5 um of a pressure fluid; d

The invention pertains more particularly to improvements of gunsof the construction,

shown and described in my U. S. Patent N01 1,736,357, issued on the 19th day of N overnher, 1929, and its primary object resides in the provisionof means in'association with the siphon-cup of the instrument to constantly; maintain suflicient air-pressure inthe cup for the proper operation of the gun without the 1 use of air-vents such as have been heretofore devised to admit air to the lubricant-re's'ervoir at each operation.

The elimination of air-vents obviously prevents leakage during the operation aswell as when the gun is notcin -use. Itiurthernioreprevents possible incapacitation of the gunas may occur wheufor any, reason the air-ventf fails to function, as when the greasecakes in. ---same. i .1 j An embodiment of the invention'hasbeen illustrated in the accompanyingdrawingsin which like reference characters designate like parts-in the two figures. I I v V n Figure 1 of the drawings is afsectional ele-' vation of the improved spray 1 t Figure 2 is a sectiontaken on the line 22,- Figure 1. d

Figure 3 isa sectional elevation of the lu-- bricant holder after fil g Same- Referring further to the. drawings, the gun" comprises a body 5 s uitably boredto provide a valve-chamberfi connected at its inner pore tion bya duct 7 with a screw threaded socket atan end of the bodyin which a conduitS 7 connected with a conveniently,locatedfsource of air supply, is fastened by meansof a coupling 9; An axial bore 10 attheopposite end of the body likewise connects with the valvechamber, and a'passage 1E2 transverse to the bore is screW-threadedfor the applicationof a short tube 13 that connects withthe siphon cup 14.- V 4 mg m The bore 10 has three sections of progres- :sively increased diameters, thesmalles't :of which connectswith' the valve chamber and terior with the 19 28. Serial No. new I thelargestof whichirat the endof the. body and screw-threaded for the attachment oi; a bent pipe 15'. Asecond pipe 16 of smallerdi-f ameteris screwed into thesmaller of the? bore and it extends inside the largerpipe to provide an annular space through whichthet oil passes to the jet or nozzle through which, it is discharged onto the machine parts to: be lubricated, ,1 I I 'Ihe-nozzle consists of an apertured cap 171 screwed onto the end of the outer pipe around a jettip 18 screwed into the end of theinner pipe. Thecapisnormally spaced from the: tip to provide Fa, passage {for the'discharge ofthe oil butitcan be, screwed into engagement with-the tip to sealt-he; device whennot inuse. d

IMounted in, the valve chamber v6 is a :valve: device which controls the passage of air from the conduit v8 t thefairpipe 16. The device: consists of a cage .19 screwed into thechamg berin engagement with awasherror gasket '20 of soft materialjplaced.against a shoulder atitheiinner end of thecharnber to provideav resilient valve seat. 7 The cagehas oneor more ports 21 in an exterior groove for the connection of its inbore 10 of "the body into which the airpipe 16. extends.

.HThe valve proper consists of aifiat at'the end ofacstem:23 that is slidably fitted: intheJcage-l-Q and which at :itsprotruding extremity has a screw threaded connection with a head or button2 l, Q 1 t 'The valve sternisfperipherally grooved as at 25, to provide aspa'ce foraflexible sealing washer 326 which contacts with the wall e'of the cagei to prevent leakage of, air past. the

valve stein whenthelbutton is depressed to,

separate thevalve from it s' seat :The stem-is. also peripherally grooved at 27 v to provide a passage for theiair entering through thednct 'Zpasttheopen. valve, to theports 21. w

A ;hole 28 in the,stem-immediatelybelow the button: provides for the admission of an. awl orotherpointed tool to hold the stern while the, button 24 .isj-screwed upon the extremity thereof. ,The sealing washer 26 is slightly-r-larger than the opening: ofthe cage:

so that when the valve stem is pressed into the valve cage, the washer will assume the cup-shaped form shown in the drawings.

When the valve is in the closed position in which it engages the resilient gasket at the under side thereof, the diaphragm cups upward as shown in the drawings and if the button is depressed, the consequent-inward move ment of-the valve stem; causes the "diaphragm to press tightly against the'wall of the valve cage thereby sealin the latter against the escape of air around the valve stem, When the button is subsequently released, the diaphragm springing back to its normal shape, aids in returning the valve to its original position.

,The siphon on s leis-of cylindrical form and extends faxia 1 in substantially;,paral11 relationto the Tboily oftlie gun. "It -h'as'a' flanged head 29 provided with athr'eaded socket 303301 its attachment to the short tube 131 nd it has in fconununication withthenozz'le, short duct 3;1 provided"with a transverse opening 3'2for: the connection of a siphon tube This tube extends ito the end ofthe cup rearward of the; gun with relation to th'e position of its discharge ozzle and .it "is this feature in the co'nstruotion'whioh ermits or the gun being o erated at different angles from the horizontal tothe vertical 'The'head ofthe siphon-cup "has an internal- 1y screw threaded filler opening 34, provided by a neck35 of cylindrical form thatextends intofth'e cup in spaced relation togthe 'in-n'er circumferentialsurface thereof. Theneck is the element that provides for maintaining shown in'Figu" e 3, when th'e'cup is lille'dlwith the lubricant.

The ,filler opening 34 is normally closed by a'p'lug' 36 screwed upon a resilient washers? at the rim "of theneck. I V In the operation "ofthe gun, the cup isfilled with oil and .the body is connected'vfith the hose 8 of a source ,otair supply. The air passing through the duct 7 fintothe inner end of the valve chamber presses the valve 22 against the resilient seat provided by the gasket and thereby obstructs the flow of air to the-interiorof the valve cage.

To apply the oil to a-n1achine1part ,the 'button is depressed which separates the valve from'its seat and establishes ,a line of com munication betweenjthe sourceof mun- 1- the pipe 16 'by means of the conduit 8, ithe duct 7 ,"the valve'chamberfi, the port or ports '21 of the cagelQ'and the bore 100f the housing. The air forcibly =drivenfithrough theet 18 at the end-of the pipe, produces a'partial vacuum which draws the oil from'thef siphon ,cup through the pipe connection 13 and the annular space between the pipes 15 and I6 and causes it to issue throughthe "aperture offthe anately i iddegrees'to render its nozzle accessible to different parts of an automobile from point beneath the same. The cup-shaped washer of the valve effectively seals the valve chan'ib'er' against the escape of air without restricting. or otherwise interfering with Y the movementofuthe valve, and the position of the siphon cup andthe siphon pipe relative torthe'bodyeof the gim ,permits o'fusing the gun'at different angles as hereinbefore explained.

A'tthe'time the cup 14 was filled, sutficient air was entrapped in the space around the inwardly-projecting filler-neck, as shown-in F igurge fiftoenable the. vacuum created at then'ojz'zle to draw-the liquid from the receptacle to and through theopening of the nozzle. Under ordinary worki g conditions the gun isl in operation ibutja few moments at one time'and when'the operation is discontinued by release of the valvesbuttomthe vacuum at the nozzle is'broken. I j

Inasmuch as the container isair tight, and

part of it'sliquid content has been withdrawn, thetentrapped airinthe container hase'rip'anded. It'follows that, owing to the an air-pressure in the duct'without the use of vents or valves, since it causes air to been trapped in the annularspace around "it,.as

deiC f a'sc ofuirg ressurei'n the container, air is gdravvn in attheend fthe nozzle, which forces the oil in the annular space between the nozzle ipe 15 and the air pipe .16, rearwardlyand back into the cup. The nozzle pipeis thus'cleared of oil at the end of each operation so that the gun may be laid or hung in. any position without the possibility of leakage at the nozzletip.

,At the same ti'me,;the air entering the contai'ner,'brings the 'air entrapped therein back to atmospheric pressure, thus restoring-the instrument to its normal condition for subsequent operation, and, thereby prevents a partial vacuum inthe cu 14.

The above results are attained automatically "after each operation of the gun and.

without the use of air-vents or valves which were previously considered essential and whichwere a constant source of leakage and uioapacitation. j v

the use of the present invention, as

'hereinb'efore described, leakage .of oil'at any desire tovlsecure by Lettainer, an oil discharge conduit having a nozzle for the discharge of liquid at its outer end and provided with an inlet in that portion of the container lowermost when the gun is in its operative position, an air pipe having a ct cooperating with theonozzle, and valve-controlled means to connect the airpipe with a source of pressure-fluid, the container having remote from the inlet of the 30 conduit, a filler neck projecting into the container to define a space for the entrapment of air when the container is being filled, and a movable member providing an air-tight closure for the filler-neck. v 2. A spray gun comprising a lubricant container, an oil discharge conduit having a nozzle for the discharge of liquid at its outer end and provided with an inlet in that portion of the container lowermost when the gun is in its operative position, and adjacent an 7 end of the container, an air pipe having a jet cooperating with the nozzle, and valve-controlled means toconnect the air-pipe with a source of pressure-fluid, the container having in its end opposite to that adjacent the inlet of the oil-pipe, a filler-neck that projects inwardly into the container, to define a space for the entrapment of air when the container, in a position in which its end having the so filler neck is uppermost, is being filled, and a movable member providing an air-tight closure for the filler-neck.

In testimony whereof 'I have aflixed my signature. 2- 5 CARL A. NORGREN. 

